RARE Fossil Ammonite Bullatimorphites bullatus – Lower Callovian, Jurassic – Deux-Sèvres, France – Certified – Alice Purnell Collection

Description

RARE FOSSIL AMMONITE – Bullatimorphites bullatus

Lower Callovian Stage | Jurassic Period

DEUX-SÈVRES, FRANCE

This listing features a superb and scientifically relevant specimen of Bullatimorphites bullatus, a genus of extinct ammonite molluscs from the Lower Callovian Stage of the Middle Jurassic, approximately 166–164 million years ago. Found in Deux-Sèvres, France, this fossil represents a well-preserved and classic example of its type.

This ammonite was part of the renowned Alice Purnell Collection and comes with a Certificate of Authenticity. The specimen shown in the photos is the exact item you will receive. A 1cm scale cube is provided in the images for accurate sizing — full measurements are shown in the listing photos.

GEOLOGICAL & TAXONOMIC DETAILS:

• Species: Bullatimorphites bullatus
• Geological Period: Jurassic
• Stage: Lower Callovian (~166–164 Ma)
• Location: Deux-Sèvres, France
• Depositional Environment: Shallow marine shelf, carbonate-rich environment with occasional siliciclastic input
• Biozone: Frequently associated with the Macrocephalites gracilis Zone
• Order: Ammonitida
• Superfamily: Stephanoceratoidea
• Family: Stephanoceratidae
• Class: Cephalopoda
• Phylum: Mollusca

MORPHOLOGY FEATURES:

Bullatimorphites bullatus displays several key morphological traits:

• Involute shell with a moderately narrow umbilicus
• Smooth to weakly ribbed surface, occasionally with faint growth lines
• Globular whorl section, giving it a slightly inflated appearance
• A rounded venter with little to no keel
• Delicate ornamentation typical of its genus, differing from more heavily ribbed contemporaries

PALEONTOLOGICAL SIGNIFICANCE:

This genus is notable within the Stephanoceratidae family for its evolutionary adaptation toward smoother shells during a period when environmental pressures may have selected for less ornamented forms. Bullatimorphites bullatus often serves as a biostratigraphic marker for the early part of the Callovian in Europe and is frequently referenced in Jurassic marine correlation studies.

The Callovian period saw dynamic marine changes, with widespread shallow seas covering much of Europe. Fossils from this interval reflect a rich assemblage of evolving ammonite lineages, including Bullatimorphites, which is less commonly found than other contemporaries, adding to its rarity and value.

SPECIMEN SUMMARY:

• Species: Bullatimorphites bullatus
• Age: Lower Callovian, Middle Jurassic (~166–164 Ma)
• Location: Deux-Sèvres, France
• Preservation: Excellent – diagnostic features clearly visible
• Authenticity: Certificate of Authenticity included
• Collection: Alice Purnell
• Scale Reference: 1cm cube shown in photos – see images for exact sizing

This rare fossil is ideal for collectors of Jurassic marine fauna, ammonite specialists, or anyone interested in acquiring a fine, well-documented specimen from a classic European locality.